Features of the Material Composition of the Main Oil and Gas Complex of the Shu-Sarysu Basin

Abstract

The article deals with exploration of the features of the material composition of the main oil and gas complex of the Shu-Sarysu basin. In the process of studying the Carboniferous-Permian section, rock samples were taken from two lithologicstratigraphic sections of the Lower Carboniferous and Permian systems, from which the most representative rocks were selected, giving an idea of the material composition of the rocks of this stratigraphic section of the Shu-Sarysu depression. Further thermal and X-ray diffraction analyzes of these samples were carried out. Mineralogical interpretation of the analysis results showed the presence in the samples a number of formations, among which there are silicon oxides, feldspars, minerals of layered silicates, carbonates, etc. The method of localization of concentrated and dispersed forms of OM in the compositions of quartz formations is based on the laws of physical and ion sorption. Therefore, connection with the surface of crystals of other minerals is carried out mainly by means of underlying films made of secondary minerals of the group of phyllosilicates. The article proves that: 1) the packaging of OM in clay minerals takes place in the intergrid spaces of their layered structures or over the broken connections of the planes of the silicon-oxygen frame of montmorillonites and members of this series of minerals; 2) in limestones concentration of Corg takes place in micro pores, as well as in cracks and chips of monomineral forms of СаСО3; 3) the background content of the dispersed organic matter (DOM) in the Carboniferous-Permian section is uniformly distributed in the range 0.1-0.5%; 4) in terrigenous rocks, in which feldspars and clay minerals predominate, the DOM content reaches 2%; 5) the obtained data will be used to correct the forecast resources of the southwestern part of the Shu-Sarysu basin.